Making a handle for a bottle with a rounded grip for fingers
You could try it this way:


At first, to make the base, use an Array then a Simple Deform / Bend mode. At the end, keep a copy then apply both the 2 modifiers, then use a Mirror on X and Y as the object is symmetrical on these axis.





To create the handle you'll begin to extrude some faces of the base. Use your picture as a background to make sure you follow the shape.